Harizanov, Rumen, et al. “STRUCTURE AND DYNAMICS OF IMPORTED PARASITIC DISEASES IN BULGARIA (2014-2020): CHALLENGES AND RISKS FOR THE PUBLIC HEALTH SYSTEM”. PROBLEMS of Infectious and Parasitic Diseases, vol. 49, no. 2, Aug. 2021, pp. 40-46, https://doi.org/10.58395/pipd.v49i2.72.